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Method and system for calibrating threshold value of smoke alarm

A technology for smoke alarms and calibration methods, which is applied to alarms, fire alarms and instruments that rely on smoke/gas effects, can solve the problems of large errors and high calibration costs, and achieve the goal of eliminating the influence of sensitivity and improving accuracy Effect

Active Publication Date: 2021-05-28
SHANGHAI BEILING
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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a low-cost, high-precision threshold calibration method and system for smoke alarms in order to overcome the defects of high cost and large error in the threshold calibration of smoke alarms in the prior art

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  • Method and system for calibrating threshold value of smoke alarm

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Embodiment Construction

[0038] The present invention will be further described below by means of a preferred embodiment, but the present invention is not limited to the scope of the described embodiment.

[0039] This embodiment provides a threshold calibration system for smoke alarms, refer to figure 1 , the calibration system includes an MCU101 and a smoke control chip 102.

[0040] MCU 101 is used to set LTD minimum value LTD min , LTD max LTD max . The MCU 101 is also used to set the gain value G; the smoke control chip 102 is used to receive the gain value, perform LTD test, and output the LTD test value LTD t ; MCU 101 is also used to receive the LTD test value LTD t , and judge the LTD test value LTD t Is it greater than the minimum value of LTD LTD min And less than LTD maximum value LTD max , if not, the MCU 101 is also used to adjust the gain value according to the linear algorithm to obtain a new gain value, update the gain value to the new gain value, and output the updated gain va...

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Abstract

The invention discloses a threshold value calibration method and system of a smoke alarm. The calibration method comprises the following steps: S1, setting the minimum value of LTD and the maximum value of LTD; S2, setting the gain value; S3, receiving the gain value of the smoke sensing control chip , and carry out the LTD test, and output the LTD test value; S4, judge whether the LTD test value is greater than the minimum value of LTD and less than the maximum value of LTD, if so, then perform step S6; if not, then perform step S5; S5, adjust the gain according to the linear algorithm value, update the gain value to a new gain value, and execute step S3; S6, set a normal alarm threshold for the smoke control chip according to the LTD test value. The invention automatically adjusts the internal gain of the smoke control chip, controls the LTD value within a reasonable range, thereby eliminating the influence of the maze difference on the sensitivity, and improving the calibration accuracy of the threshold value of the smoke alarm.

Description

technical field [0001] The invention belongs to the technical field of smoke alarms, in particular to a method and system for calibrating the threshold of smoke alarms. Background technique [0002] With the improvement of people's safety awareness and the intelligent networking of security systems, smoke alarms have been more and more widely used in the Internet of Things and smart home bureaus. [0003] The widely used smoke alarms include ionization smoke detectors and photoelectric smoke detectors. Taking the scattering photoelectric smoke alarm as an example, the working principle of the smoke alarm is: the photoelectric smoke alarm is mainly composed of a smoke control chip, an optical labyrinth and a buzzer. There is an optical labyrinth in the photoelectric smoke alarm, and infrared emitting and receiving tubes are installed. [0004] In a normal environment, when there is no smoke, the infrared receiving tube cannot receive the infrared light emitted by the infrar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08B17/10G08B29/26
CPCG08B17/10G08B29/26
Inventor 阮颐张勇宋清亮邓正敏李军
Owner SHANGHAI BEILING
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